/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package session;

import GUI.EntityGUI;
import Interface.Entity;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import storage.StorageInterface;

/**
 * Developed for NTT - All is an Entity
 * Questa Servlet offettua il login di un utente, i parametri vengono passati
 * tramite il metodo POST e sono:
 * username = nome del'utente
 * password = parola di accesso dell'utente
 * @author Alessandro Pollace
 * @version 0.1
 */
@WebServlet(name = "Login", urlPatterns = {"/Login"})
public class Login extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession sessione = request.getSession();
        String s = null;
        try {
            if (sessione.getAttribute("username") == null) {
                //effettua il login
                StorageInterface storage = new StorageInterface();
                EntityGUI e = new EntityGUI("User");

                Entity e2 = new EntityGUI("User");
                EntitySession e3;
                e3 = (EntitySession) e2;
                String username = request.getParameter("username");
                String passwd = request.getParameter("password");

                e.setAttributeValueSuperMode("username", username);
                e.setAttributeValueSuperMode("password", passwd);
                e3.setAttributeValueSuperMode("username", username);
                e2 = storage.load(e2);
                e3 = (EntitySession) e2;
                if (e.equals(e2)) {
                    sessione.setAttribute("username", username);
                    sessione.setAttribute("gruppo", e3.getAttributeValueNoLimits("gruppo").toString());
                    response.sendRedirect("index.jsp");
                } else {
                    response.sendRedirect("index.jsp?login=warning");
                }



            }

        } catch (Exception e) {
            response.sendRedirect("index.jsp?login=warning");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
